I checked on the Schinke marriages in Cuming County when I was in Lincoln, Nebraska the last time, and found the following:
Hermin Schinke married Angelina Miles on 23 Feb 1876. Hermin was born in Canada on 20 Oct 1854, the son of John Schinke and Charlote Silke. Angelina was born in Pennsylvania on 17 Sep 1857, the daughter of Samuel MIles and Elizabeth Leanik or Seanik.
Nathaniel Schinke married Mary Reeson on 7 Nov 1878. Nathaniel was born in Canada on 5 Sep 1857, son of John Schinke and Charlotte Silke. Mary was born in Will County, IL 11 Aug 1853 daughter of Samuel Reeson and Harriet Maddock.
Charles Kolterman married Elizabeth Schinke on 4 Jan 1876. Charles was born in Prussia on 25 Apr 1854, son of Wm. Kolterman and Wilhelmina Kryger. Elizabeth was born in Canada 5 Feb 1856, daughter of John Schinke and Charlottel Sutke (the u has an umlaut above it).
There are two families in Cuming County, both with the husband's last name Grunke/Grinke and the wife, Schinke/Schunke. One group coming from Wisconsin and the other from Canada - both about the same time. I'm convinced they are connected, perhaps the husbands are brothers or cousins and the wives, the same. Families from the same areas of Germany were so intermarried, that the 'coincidence' of two so similar named families arriving from two different areas to the same small town in Nebraska at the same time must be connected, though it may take a trip to Germany to sort it all out.